Spinning frame and method



June 8, 1948. J T, DRENNEN 2,442,761

SPINNING FRAME AND METHOD Filed Oct. 31, 1945 NVENTOR.

Patented June 8, 1948 SPINNING FRAME AND LETHOD John T. Drennen, Prospect Hill, N. Y., assignor to American Viscose Corporation, Wilmington, Del, a corporation of Delaware Application October 31, 1945, Serial No. 625,876

This invention relates to spinning frames and particularly to the type that is used in spinning yarns on the woolen system which comprises a pair of back restraining rolls, a pair of front drawing rolls driven at higher speed and a twisting tube therebetween for imparting false twist to control the drafting.

In this system as heretofore employed, the twist imparted by the false twister extends all the way from the roving entrance of the twisting device back to the nip of the back rolls. It has been found that when drafting certain long staple fibers (especially when of 3% inches or greater length) such as rayon, where a high amount of draft is desired, a higher degree of false twist is necessary in order to properly control the drafting action. Also this high false twist appears to be necessary with fibers having relatively smooth surfaces, such as nylon, glass, and the like. When the speed of the twister tube is increased to impart a high false twist to the roving, it has been found that the roving slips through the back rolls so that the back rolls do not uniformly control the draft at all times.

The principal object of the present invention is to provide a modifieds'pinning system which is capable of yielding improved results when it is necessary or desirable to employ a high degree of draft or false twist, such as in the drafting of long fibers or relatively smooth-surfaced fibers. Other objects and advantages of the invention will be apparent from the drawing and the description thereof hereinafter.

The single figure of the drawing illustrates an end elevation of a preferred embodiment of the invention which is applied to a woolen system spinning frame comprising a pair of back restraining rolls 2, a pair of front drawing rolls 3 and a false twisting tube 4. The back and front rolls are driven positively so that the front rolls draw the roving at a higher rate of speed than it is delivered by the rolls 2. The false twisting tube is also rotated at any desired speed by means of the belt 5, engaging the sheath 5 on the tube. The false twisting tube may be provided with the conventional pegs TI to impart an agitation or fluctuating pull to the roving, and a stationary pin or rod 3 may be provided as and for the conventional purposes. The drafted roving delivered by front rolls 3 may proceed through a stationary guide 9 to any conventional form of twisting take-up I 0, such as a ring twister shown, a cap twister, or the like.

As so far described, the various parts are conventional and no claim is made to their relationship per so. However. in accordance with the present invention, there is provided in front of the back rolls and adjacent thereto a guide Ii through which the roving passes and by which it is deflected from the straight line course it would otherwise take from the back rolls to the top of the false twister tube. This guide, as shown, deflects the roving downwardly from its straight line course, but it is to be understood that the guide may be arranged to deflect it in any other direction from the straightline course that the roving would otherwise take from the back rolls to the top of the false twister tube were the guide to be omitted.

The deflecting guide ll limits the backing up of the twist along the roving so that it cannot get back into the nip between the back rolls 2. The extent by which the roving must be deflected from the normal straight line between the nip of the back rolls and the top of the false twister tube depends somewhatupon the particular fibers of which the roving is composed and upon the amount of false twist used, but generally a deflection of the order of as little as 10 to 15, measured from the nip of the back rolls, is adequate for most fibers to prevent the backing up of any substantial part of the twist beyond guide ii to the nip 2. The guide may be set at any desired angle merely by loosening and then tightening the screw it.

The twist controlling guide ll thus permits a high twist to be applied to the roving when high draft is employed or when the roving is composed of slippery-surfaced fibers, while preventing such high twist from carrying back to the nip of rolls 2 and causing slippage of the roving therebetween. The lack of twist or the presence of a low degree of twist in the roving between the guide H and the nip of the back rolls 2 assures that proper traction is exerted by the rolls against the roving at all times, therebyassuring the production of uniform quality of yarns.

It is to be understood that changes and variations may be made without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. The'method of spinning textile fibers comprising subjecting the roving of the fibers to a drafting action as it proceeds from one set of positively driven restraining rolls to a set of positively driven drawing rolls operating at a higher peripheral speed than therestraining rolls, imparting a high degree of false twist to the course of the roving between the sets of rolls, and deflectin: the roving about a stationary surface so that its course to the surface is substantially inclined any considerable proportion of the twist is preirom the straight *line course that the roving would normally take from the nip of the restraining rolls if undefleeted.

2. The method of spinning textile fibers comprising subjecting the roving of the fibers to a drafting action as it proceeds from one set of positively driven restraining rolls to a set of positively driven drawing rolls operating at a higher peripheral speed thanthe restraining rolls, imparting a high degree of false twist to the course of the roving between the sets Manila, and deflecting the roving about a stationary surface so that its course to the surface is-inclined through an angle of at least the order of about 10 to 15 at the nip of the restraining rolls from the straight line course that the roving would normally take from the nip of the restraining rolls if undeflected.

3. In a spinning frame, a set of restraining rolls; a set of drawing rolls, means for driving both sets of rolls so that the drawing rolls run at a higher rate of linear speed than the restraining rolls, a false twisting device between the restraining rolls and the drawing rolls, means for rotating the false twist device, and an adjustably mounted,

removable guide positioned in proximity to the delivery side of the restraining rolls and having a stationary surface adapted to engage the roving from the nip of the restraining rolls to the entrance of the false twisting device from the normal straight line course that it would otherwise take between said nip and said entrance, whereby for deflecting the course of the roving proceeding 30 vented from backing up to the nip between the restraining rolls.

4. In a spinning frame, a set of restraining rolls, a set of drawing rolls, means for driving both sets of rolls so that the drawing rolls run at a higher rate of linear speed-than the restraining rolls, a false twisting device between the restraining rolls and the drawing rolls, means for rotating the false twist device, and a guide positioned in proximity to the delivery side of the restraining rolls and being positioned to one side of the straight line path between the nip oi the restraining rolls and the entrance of the twisting device a sufficient distance to deflect the roving passing through the guide so that its path takes a line at an angle of the order of at least 10 to 15 from said straight line path as measured at the nip.

JOHN T. DRENNEN.

REFERENCES CITED,

The following references are of record in the file of this patent:-

UNITED STATES PATENTS Number Name Date 806,086 Pease Nov. 28, 1905 1,770,085 Owen July 8, 1930 2,321,504 McCann "June 7, 1943 FOREIGN PATENTS Number Country Date 11,750 Sweden Aug. 30, 1899 

